package DesignPatern.A16_观察者模式.QSB.A01_基础模式;

/**
 * @Author: Du
 * @Date: 2021/8/2 11:48
 */
public interface Observable
{
    public void addObserver(Observer observer);
    
    public void deleteObserver(Observer observer);
    
    public void notifyObservers(String context);
}
